#5DA2CD

CSS

:root {
  --sub-zero: #5da2cd;
  --sub-zero-rgb: 93 162 205;
  --sub-zero-oklch: oklch(0.684 0.095 237.7);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(203 53% 58%);
  border-color: oklch(0.684 0.095 237.7);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5da2cd;
  --color-sub-zero-50: #defaff;
  --color-sub-zero-100: #ccedff;
  --color-sub-zero-200: #b0dbf9;
  --color-sub-zero-300: #8bbfe3;
  --color-sub-zero-400: #66a7d0;
  --color-sub-zero-500: #408fbd;
  --color-sub-zero-600: #3879a0;
  --color-sub-zero-700: #2c6180;
  --color-sub-zero-800: #1d475f;
  --color-sub-zero-900: #133142;
  --color-sub-zero-950: #051d2b;
}

SCSS

$sub-zero: #5da2cd;
$sub-zero-rgb: 93, 162, 205;
$sub-zero-light: mix(#fff, $sub-zero, 20%);
$sub-zero-dark: mix(#000, $sub-zero, 20%);

.element {
  color: $sub-zero;
  box-shadow: 0 0 0 2px rgba($sub-zero, 0.35);
}